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도시물류 시스템 운영 시나리오 검증을 위한 EFFBD(Enhanced Functional Flow Block Diagram) 기반 모델 개발
채우리,황재민,이재덕,장경호,김주욱 한국물류과학기술학회 2023 물류과학기술연구 Vol.4 No.1
The COVID-19 pandemic has instigated a global surge in logistics volume, thus precipitating a myriad of socio-economic issues worldwide. To address these ramifications, numerous nations have embarked on research initiatives exploring the viability of urban railway utilization. However, the conception of a integrative and tangible framework for a logistics transportation system leveraging underground spaces remains an elusive challenge. This research undertakes the development of a novel scenario for an urban logistics system that capitalizes on the underutilized urban rail infrastructure currently being developed in South Korea. The scenario development is executed through the application of an EFFBD based model, the effectiveness of which is subsequently validated via timeline analysis. Through this validation process, the successful establishment of initial subsystem standards was discerned, indicating potential applicability of the model in real-world contexts. By proposing the possibility of integrating underground spaces into logistics networks, this research provides a critical foundation for stimulating subsequent investigations in the field of underground logistics. The proposition of leveraging underground spaces for logistics purposes could potentially catalyze the sustainable evolution of the logistics industry, and be instrumental in shaping both academic and practical discourse on urban logistics systems.
DCJTB를 도핑시킨 단층 Alq₃소자에서 Two-color filter를 사용한 발광영역의 결정
채우리,채희백,최성진 순천향대학교 기초과학연구소 2011 순천향자연과학연구 논문집 Vol.17 No.2
A doping layer of thickness 2 nm of DCJTB(guest) was dopoed 1 % and varied its location 5nm each from the anode to the cathode in a single layer Alq(60 nm, host) OLED in order to investigate the region of charge recombination and light emission. Major emission peak was located 20 nm from the anode and the emission region was shown to be spread through the whole layer of Alq. We also investigate a method to determine the recombination zone with two-color filter from TEL
채우리;이유근;최성진;채희백 순천향대학교 기초과학연구소 2010 순천향자연과학연구 논문집 Vol.16 No.2
OLEDs of the bilayer structure with ITO/NPB/Alq3/LiF/Al were fabricated by vacuum thermal evaporation. I-V-L(current-voltage-luminance) and charge mobility could be measured with TEL(transient electroluminescence) as the temperature was varied from 300K to 50 K. Current, current density and EL were decreased as the temperature was decreased.
주거공간의 혼합형 광선반 각도 변화에 따른 채광성능 평가
채우리(Woori Chae),이행우(Heangwoo Lee),서장후(Janghoo Seo),김용성(Yongseong Kim) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.9
The purpose of this study is to evaluate the effectiveness in the lighting performance of mixed type light-shelf, by comparing and analyzing the internal light-shelf, external light-shelf, and mixed-type light-shelf. The performance of light-shelf was evaluated according to the angle of light-shelf at summer solstice, winter solstice, vernal equinox, and autumn equinox. The comparative analysis between the internal light-shelf, external light-shelf, and mixed-type light-shelf was carried out using the performance evaluation and analysis method. The result of performance evaluation is shown as follows. The mixed type light-shelf showed the highest lighting performance all at summer solstice, winter solstice, vernal equinox, and autumn equinox, followed by the external light-shelf and the internal light-shelf in the same order. The mixed type light-shelf was the most favorable for bringing daylight to indoors by adjusting the angle of light-shelf, and it also showed the highest lighting performance in terms of uniformity ratio of illumination which indicates the quality of light.
Optimization of DME Reforming using Steam Plasma
정경수,채우리,채호근,정명석,이주연 한국산업정보학회 2019 한국산업정보학회논문지 Vol.24 No.5
In today's global energy market, the importance of green energy is emerging. Hydrogen energy is the future clean energy source and one of the pollution-free energy sources. In particular, the fuel cell method using hydrogen enhances the flexibility of renewable energy and enables energy storage and conversion for a long time. Therefore, it is considered to be a solution that can solve environmental problems caused by the use of fossil resources and energy problems caused by exhaustion of resources simultaneously. The purpose of this study is to efficiently produce hydrogen using plasma, and to study the optimization of DME reforming by checking the reforming reaction and yield according to temperature. The research method uses a 2.45 GHz electromagnetic plasma torch to produce hydrogen by reforming DME(Di Methyl Ether), a clean fuel. Gasification analysis was performed under low temperature conditions (T3 = 1100°C), low temperature peroxygen conditions (T3 = 1100°C), and high temperature conditions (T3 = 1376°C). The low temperature gasification analysis showed that methane is generated due to unstable reforming reaction near 1100℃. The low temperature peroxygen gasification analysis showed less hydrogen but more carbon dioxide than the low temperature gasification analysis. Gasification analysis at high temperature indicated that methane was generated from about 1150°C, but it was not generated above 1200°C. In conclusion, the higher the temperature during the reforming reaction, the higher the proportion of hydrogen, but the higher the proportion of CO. However, it was confirmed that the problem of heat loss and reforming occurred due to the structural problem of the gasifier. In future developments, there is a need to reduce incomplete combustion by improving gasifiers to obtain high yields of hydrogen and to reduce the generation of gases such as carbon monoxide and methane. The optimization plan to produce hydrogen by steam plasma reforming of DME proposed in this study is expected to make a meaningful contribution to producing eco-friendly and renewable energy in the future.